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Note 18 - Subsequent Events (Details) (Subsequent Event [Member], USD $) In Millions, unless otherwise specified	Nov. 06, 2014
Subsequent Event [Member]
Note 18 - Subsequent Events (Details) [Line Items]
Stock Repurchase Program, Authorized Amount	$ 10.0

X

- Details

Name:	amph_Note18SubsequentEventsDetailsLineItems
Namespace Prefix:	amph_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant